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NG_BLUETOOTH(4) FreeBSD Kernel Interfaces Manual NG_BLUETOOTH(4)
NAMEng_bluetooth - placeholder for global Bluetooth variables
SYNOPSIS#include <sys/types.h>
#include <netgraph/bluetooth/include/ng_bluetooth.h>
DESCRIPTION
The ng_bluetooth module is a placeholder for global Bluetooth variables.
All Bluetooth variables can be examined and changed via sysctl(8).
BluetoothVariables
Below is the description of default variables. Each Bluetooth module
might add its own variables to the tree.
net.bluetooth.version
A read-only integer variable that shows the current version of
the Bluetooth stack.
net.bluetooth.hci.command_timeout
A read-write integer variable that controls the Host Controller
Interface (HCI) command timeout (in seconds), i.e., how long the
HCI layer will wait for the Command_Complete or Command_Status
event from a Bluetooth device.
net.bluetooth.hci.connection_timeout
A read-write integer variable that controls the HCI connection
timeout, i.e. how long the HCI layer will wait for the
Connection_Complete event. Normally this should not be required
as Bluetooth devices have connection timeout of their own and
will send event back. This timeout is required to ensure that no
connection will stall in case when the HCI transport layer is
broken. Be careful when changing this variable. Make sure you
understand what you are doing.
net.bluetooth.hci.max_neighbor_age
A read-write integer variable that controls time-to-live (in
seconds) for entries in the HCI neighbor cache. Every time a
Bluetooth device performs an Inquiry operation, the results will
be put in cache. Later when a Bluetooth device establishes a
baseband connection, it will try to find the matching entry in
the cache and use it. This might speed up establishment of the
baseband connection.
net.bluetooth.l2cap.rtx_timeout
A read-write integer variable that controls the Link Layer
Control and Adaptation Protocol (L2CAP) Retransmission Timeout
(RTX) (in seconds). Every time the L2CAP layer submits a control
command, the RTX timeout is set. The value of the RTX timeout
should be greater or equal to the value of the HCI connection
timeout. Be careful when changing this variable. Make sure you
understand what you are doing.
net.bluetooth.l2cap.ertx_timeout
A read-write integer variable that controls the L2CAP Extended
Retransmission Timeout (ERTX) (in seconds). In some cases remote
peer may respond with PENDING status to the L2CAP control
command. In this case the L2CAP command timeout is reset to the
ERTX timeout value. The value of the ERTX timeout should be
greater or equal to the value of the RTX timeout. Be careful
when changing this variable. Make sure you understand what you
are doing.
SEE ALSOng_btsocket(4), ng_hci(4), ng_l2cap(4), sysctl(8)HISTORY
The ng_bluetooth module was implemented in FreeBSD 5.0.
AUTHORS
Maksim Yevmenkin <m_evmenkin@yahoo.com>
FreeBSD 11.0-PRERELEASE November 9, 2002 FreeBSD 11.0-PRERELEASE